Module:Sports reference
| Ready for use | This module is rated as ready for general use. It has reached a mature form and is thought to be relatively bug-free and ready for use wherever appropriate. It is ready to mention on help pages and other Wikipedia resources as an option for new users to learn. To reduce server load and bad output, it should be improved by sandbox testing rather than repeated trial-and-error editing. | 
Template:Uses Wikidata Template:Tracks Wikidata
Usage edit source
This module returns a link to Olympics at Sports-Reference.com. The module only has one function, link, which returns the external link text ready for use.
{{#invoke:Sports reference|link|id (optional)|name (optional)}}
For complete usage and examples, see the {{Sports reference}} template:
local function category(s)
	if mw.title.getCurrentTitle().namespace ~= 0 then
		return ""
	end
	return "[[Category:Sports-Reference template " .. s .. "]]"
end
local function linktext(s1,s2,s3)
	if (s3 == nil) or (s3 == "") then
		return "[https://timetravel.mementoweb.org/memento/20161204/https://www.sports-reference.com/olympics/athletes/" .. s1 .. ".html " .. s2 .. "] at [[Sports Reference#Olympics|Olympics at Sports-Reference.com]] (archived)" .. category("missing archive parameter")
	else
		return "[https://web.archive.org/web/" .. s3 .. "/https://www.sports-reference.com/olympics/athletes/" .. s1 .. ".html " .. s2 .. "] at [[Sports Reference#Olympics|Olympics at Sports-Reference.com]] (archived)"
	end
end
local p = {}
function p.link(frame)
	-- Optional first parameter contains ID portion of Sports-Reference URL.
	-- Trim any leading or trailing spaces. If it contains ".html", remove it.
	local id = string.gsub((mw.text.trim(frame.args[1]) or ""), ".html", "")
	-- Optional second parameter contains name for link. Trim leading or trailing spaces.
	-- If name is not provided, use article name without disambiguation.
	local name = mw.text.trim(frame.args[2])
	if (name == nil) or (name == "") then
		name = string.gsub(mw.title.getCurrentTitle().text, "%s+%b()$", "", 1)
	end
	-- Optional third parameter contains date/time portion of Archive.org URL.
	local archive = mw.text.trim(frame.args[3])
	-- For articles without Wikidata property:
	-- if ID not provided, return error text and tracking category
	-- if ID is provided, return link and tracking category
	local entity = mw.wikibase.getEntityObject() or {}
	local claims = entity.claims or {}
	local hasProp = claims["P1447"]
	if not hasProp then
		if (id == nil) or (id == "") then
			return "<span class='error'>Sports-Reference template missing ID and not present in Wikidata.</span> [[Template:Sports reference#Add ID in Wikidata|How do I fix this?]]" .. category("missing ID and not in Wikidata")
		else
			return linktext(id,name,archive) .. category("with ID not in Wikidata")
		end
	end
	-- For articles with Wikidata property:
	-- if ID not provided, return link (using Wikidata) and tracking category
	-- if ID is provided, return link (using ID) and one of two tracking categories
	local propValue = hasProp[1].mainsnak.datavalue.value
	if (id == nil) or (id == "") then
		return linktext(propValue,name,archive) .. " [[File:OOjs UI icon edit-ltr-progressive.svg |frameless |text-top |10px |alt=Edit this at Wikidata |link=https://www.wikidata.org/wiki/" .. entity.id .. "#P1447|Edit this at Wikidata]]"   -- .. category("using Wikidata")
	end
	for i, v in ipairs(hasProp) do
		propValue = (v.mainsnak.datavalue or {}).value
		if id == propValue then
			return linktext(id,name,archive)   -- .. category("with ID same as Wikidata")
		end
	end
	return linktext(id,name,archive) .. category("with ID different from Wikidata")
end
return p